sir/mam Replace the print head the device that houses the machine LASER, or the "J" or "A" printed circuit boards. Go with the LASER first if you can find one the Di520/620 are legacy machines from Minolta now Konica Minolta. Reset is Power off the Power on.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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